Question 1

Which of the following best explains why atoms form chemical bonds with other atoms?

Accepted Answer

To achieve a completely filled outermost energy shell of electrons

Question 2

A sodium atom (Na) loses one electron to become a sodium ion (Na$$^+). $$What type of bond is most likely to form between Na$$^+$$ and Cl$$^- in $$table salt?

Accepted Answer

Ionic bond

Question 3

Which of the following statements about hydrogen bonds is correct?

Accepted Answer

They are weak electrical attractions between partial charges of polar molecules

Question 4

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond where electrons are shared unequally between atoms with different electronegativities

Question 5

Which of the following is a correct example of a reduction and oxidation (redox) reaction in a biological system?

Accepted Answer

NAD$$^+ + 2e$^- + 2H$^+$$ $$\rightarrow$$ NADH + H$$^+$$

Question 6

Which of the following best explains why phospholipids are essential for cell membrane structure?

Accepted Answer

They have both hydrophilic heads and hydrophobic tails, allowing them to form bilayers in aqueous environments

Question 7

A patient is diagnosed with a genetic disorder that affects the formation of peptide bonds. Which macromolecule's synthesis is most directly impacted?

Accepted Answer

Proteins

Question 8

Which of the following is NOT a function of carbohydrates in cells?

Accepted Answer

Catalyzing chemical reactions

Question 9

Which of the following best describes the difference between a monosaccharide and a polysaccharide?

Accepted Answer

A monosaccharide is a single sugar unit, while a polysaccharide is a chain of many sugar units linked together

Question 10

Which of the following statements about nucleic acids is correct?

Accepted Answer

DNA and RNA store and transmit genetic information in cells and viruses

Question 11

A scientist is studying a molecule with the following structure: a central carbon atom bonded to an amino group, a carboxyl group, a hydrogen atom, and a variable R group. What type of molecule is this?

Accepted Answer

Amino acid

Question 12

Which of the following best explains the antiparallel nature of DNA?

Accepted Answer

The two strands run in opposite 5' to 3' directions

Question 13

Which of the following is a correct pairing of a functional group with its macromolecule class?

Accepted Answer

Amino group — Proteins

Question 14

Which of the following best describes the role of electronegativity in covalent bond formation?

Accepted Answer

It determines how equally or unequally electrons are shared between atoms

Question 15

A mutation causes a change in the primary structure of a protein. Which level(s) of protein structure could be affected as a result?

Accepted Answer

All levels: primary, secondary, tertiary, and quaternary

Question 16

Which of the following best explains why waxes are important for certain bacteria?

Accepted Answer

They provide a hydrophobic barrier that protects against desiccation and chemical damage

Question 17

Which of the following is a correct description of a disaccharide?

Accepted Answer

A carbohydrate formed by joining two monosaccharides via a glycosidic bond

Question 18

Which of the following best describes the function of steroids in cell membranes?

Accepted Answer

They help maintain membrane fluidity and stability

Question 19

A Gram-negative bacterial cell wall is characterized by which of the following features?

Accepted Answer

A thin peptidoglycan layer and an outer membrane containing lipopolysaccharides

Question 20

Which of the following best explains why cells use electron carriers such as NAD$$^+ in $$redox reactions?

Accepted Answer

To transfer electrons efficiently during metabolic processes and facilitate ATP production

Atoms, Bonds, and Biological Molecules in Microbiology

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